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- HOW TO FILL CBD OIL VAPE CARTRIDGE?HOW TO FILL AN EMPTY CBD OIL ATOMIZER? 1.Take off the mouthpiece 2.Carefully inject the oil along the inside wall of tube 3.Scew the mouthpiece tightly 4.After filling, keep the cartridges upside down for 4-5 hours,which significantly reduce the leaking rate. 5.Don't open the mouthpiece anymore once finishing filling.